#coding=utf-8

a = [{
"Key": 1,
"Val": 688695253
}
,{
"Key": 2,
"Val": 688695705
}
,{
"Key": 3,
"Val": 688695271
}
,{
"Key": 1000,
"Val": 1533186122
}
]

synckey = []
for item in a:
	tmp = "%s_%s" % ( item['Key'], item['Val'])
	synckey.append(tmp)
	print(tmp)
print('|'.join(synckey))